Answer: 
molecules of 
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
To calculate the moles, we use the equation:
1 mole of contains = molecules
0.128 mole of contains = 
molecules
Thus there are molecules of
Answer:
B) 125 mL
Explanation:
M1V1=M2V2
(0.120M)(x)=(150.0 mL)(0.100M)
x= 125 mL
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3Ca(NO3)2(aq) +Fe2(SO4)3(aq)-----> 3CaSO4(s)+ 2Fe(NO3)3(aq)
3Ca²⁺ + 6 NO3 ⁻ +2 Fe ³⁺ +3SO4²⁻ -----> 3CaSO4(s)+2 Fe ³⁺+ 6 NO3 ⁻
3Ca²⁺+3SO4²⁻---->3CaSO4(s)
Ca²⁺+SO4²⁻---->CaSO4(s)
First convert grams to moles:
90.0g *(mole/39.997) = 2.250mole
Remember that molarity is moles per liters:
2.250mol/3L = .750 M
Molarity = 1.5
molarity = moles/liters
m= 3/2
m= 1.5
